sigaction.h

/* Copyright (C) 1991,92,96,97,98,2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#ifndef _SIGNAL_H# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."#endif/* These definitions match those used by the 4.4 BSD kernel. If the operating system has a `sigaction' system call that correctly implements the POSIX.1 behavior, there should be a system-dependent version of this file that defines `struct sigaction' and the `SA_*' constants appropriately. *//* Structure describing the action to be taken when a signal arrives. */struct sigaction
{
/* Signal handler. */#ifdef __USE_POSIX199309union
{
/* Used if SA_SIGINFO is not set. */
__sighandler_t sa_handler;
/* Used if SA_SIGINFO is set. */
void (*sa_sigaction) (int, siginfo_t *, void *);
}
__sigaction_handler;
# define sa_handler __sigaction_handler.sa_handler# define sa_sigaction __sigaction_handler.sa_sigaction#else __sighandler_t sa_handler;
#endif/* Additional set of signals to be blocked. */
__sigset_t sa_mask;
/* Special flags. */int sa_flags;
};
/* Bits in `sa_flags'. */#if defined __USE_UNIX98 || defined __USE_MISC# define SA_ONSTACK 0x0001 /* Take signal on signal stack. */# define SA_RESTART 0x0002 /* Restart syscall on signal return. */# define SA_NODEFER 0x0010 /* Don't automatically block the signal when its handler is being executed. */# define SA_RESETHAND 0x0004 /* Reset to SIG_DFL on entry to handler. */#endif#define SA_NOCLDSTOP 0x0008 /* Don't send SIGCHLD when children stop. */#ifdef __USE_MISC# define SA_INTERRUPT 0 /* Historical no-op ("not SA_RESTART"). *//* Some aliases for the SA_ constants. */# define SA_NOMASK SA_NODEFER# define SA_ONESHOT SA_RESETHAND# define SA_STACK SA_ONSTACK#endif/* Values for the HOW argument to `sigprocmask'. */#define SIG_BLOCK 1 /* Block signals. */#define SIG_UNBLOCK 2 /* Unblock signals. */#define SIG_SETMASK 3 /* Set the set of blocked signals. */